Do you use "smooth shaded" display mode on all view windows ? Choose "flat shaded" or "wireframe" on some of them. the refresh rate will be faster. A "smooth shaded" display takes time, even on a fast processor.

I use "smooth shaded" display mode only for the main camera view (If the scene is very heavy I switch to "flat shaded"). For all the other views (top-side-front) I choose "wireframe" display.

Compared to all the other software I've tested, I think that VUE has a quite fast screen refreshing rate. On my system it can handle more than 20 millions polygons and "refresh" the display windows in 20 sec ("flat shaded" mode). The other softwares freeze for minutes with more than 1 million polygons. Above 3 millions polygons Amapi, Cinema 4D XL, Truespace and Electric Image Universe just crash !